Fix change detection in CfgSimplifier::collapse_goto_chain#75076
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bors merged 2 commits intorust-lang:masterfrom Aug 3, 2020
Merged
Fix change detection in CfgSimplifier::collapse_goto_chain#75076bors merged 2 commits intorust-lang:masterfrom
bors merged 2 commits intorust-lang:masterfrom
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Check that the old target is different from the new collapsed one, before concluding that anything changed.
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r? @lcnr (rust_highfive has picked a reviewer for you, use r? to override) |
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r? @oli-obk |
oli-obk
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Aug 3, 2020
| Terminator { kind: TerminatorKind::Goto { ref mut target }, .. } => target, | ||
| _ => unreachable!(), | ||
| }; | ||
| *changed |= *target != last; |
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cc @ecstatic-morse We now have a test case for this!
oli-obk
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Aug 3, 2020
| @@ -0,0 +1,7 @@ | |||
| // Caused an infinite loop during SimlifyCfg MIR transform previously. | |||
| // | |||
| // build-pass | |||
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does this really test this mir pass? don't you also need -Zmir-opt-level=2?
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For this test case no additional flags are necessary to reproduce the issue. Unlike the one from #75051 which also needed -Zmir-opt-level=2.
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@bors r+ |
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📌 Commit 7f9f2ff has been approved by |
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☀️ Test successful - checks-actions, checks-azure |
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Check that the old target is different from the new collapsed one, before concluding that anything changed.
Fixes #75074
Fixes #75051